In those days while Mordecai was sitting at the king’s gate, Bigthan and Teresh, two of the king’s eunuchs who protected the entrance, became angry and plotted to assassinate King Ahasuerus.

it was found written that Mordecai had disclosed that Bigthana and Teresh, two of the king’s eunuchs who guarded the entrance, had plotted to assassinate King Ahasuerus.

The king then had the matter investigated and, finding it to be so, had the two conspirators hanged on a gallows. It was then recorded in the daily chronicles in the king’s presence.

Therefore, because of the account found in this letter and what they had faced in this regard and what had happened to them, the Jews established as binding on themselves, their descendants, and all who joined their company that they should observe these two days without fail, just as written and at the appropriate time on an annual basis.

to have them observe the fourteenth and the fifteenth day of the month of Adar each year

In the twelfth month (that is, the month of Adar), on its thirteenth day, the edict of the king and his law were to be executed. It was on this day that the enemies of the Jews had supposed that they would gain power over them. But contrary to expectations, the Jews gained power over their enemies.